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possible or impossible?


  • 2 years ago · Quote · #141

    andrewjmen

    Tantale said not to post the answer so don't post the answer!

    Special thanks to Tantale!

  • 2 years ago · Quote · #142

    shoopi

    Yes, it's a "trick" puzzle :P

    I will post the solution to my own puzzle:

  • 2 years ago · Quote · #143

    shoopi

    Regarding puzzle 3#, any further progress on that one?

    Switching the rooks isn't easy. For this particular maneuver, you need to find a way to block the white rook from checking the black king. But how can this be done? does white have any piece that can interfere with that check?

  • 2 years ago · Quote · #144

    bishshoy_das

    I give up. No use posting half-hearted solutions. I  guess its ur turn shoopi...

  • 2 years ago · Quote · #145

    shoopi

    Alright. The really tricky trick is to use the white king in order to switch up the rooks - white rook getting to e2 (you need the white king to prevent the rook from checking the black king), then the black rook gets behind it, then the white rook gets back and viola! the switch is complete. Proof game below (watch move 51 onward for the critical maneuver):

  • 2 years ago · Quote · #146

    shoopi

    New positions coming up.

     

    First one is a composition by einstein_69101, second one is a composition by myself. Possible or impossible?

  • 2 years ago · Quote · #147

    thenextprodigy

    Second one is impossible. How could 2 rooks be on the 1st rank adjacent?

  • 2 years ago · Quote · #148

    learningthemoves

    Yeah, but that's not the final position expressed in the puzzle originally, so still impossible.

  • 2 years ago · Quote · #149

    Fralnp

    Puzzle 2 is indeed impossible see position below

    After Black plays gxh2 in that setup (the only way to get a promoted Rook on g1, White is stuck: no pawns can be pushed to alter the position and the remaining piece is pinned. Now bite me and prove me wrong as alwaysTongue out

     

  • 2 years ago · Quote · #150

    Jadeite

    Fralnp wrote:

    Puzzle 2 is indeed impossible see position below

    After Black plays gxh2 in that setup (the only way to get a promoted Rook on g1, White is stuck: no pawns can be pushed to alter the position and the remaining piece is pinned. Now bite me and prove me wrong as always

     

     

    Hm... What if there was another knight on f1, like this:

    White won't ever get stuck,  as before that sequence, he can just shuffle around the 'extra' knight.
  • 2 years ago · Quote · #151

    Fralnp

    Yes but in order for the c7-pawn to reach h2 White had to sacrifice 5 mens (excluding Bishops since they could never get out of that pawn formation), two Rooks, a Queen, a Knight and the h-pawn. I would liked a scenario like this however...

  • 2 years ago · Quote · #152

    s0030135

    The first position in #151 is possible:

     

  • 2 years ago · Quote · #153

    piphilologist

    shoopi wrote:

    and viola! the switch is complete.  

  • 2 years ago · Quote · #154

    shoopi

    s0030135 wrote:

    The first position in #151 is possible:

     


    Correct, solved!

    Still awaiting sentence for the second puzzle... good luck.

  • 2 years ago · Quote · #155

    s0030135

    [COMMENT DELETED]
  • 2 years ago · Quote · #156

    s0030135


    The second position is also possible:

  • 2 years ago · Quote · #157

    piphilologist

    edit: someone got it before me :(
  • 2 years ago · Quote · #158

    shoopi

    Congratulations to both of you!

     

    More positions coming up.

    which of these positions is legal? (composed by cobra91):

  • 2 years ago · Quote · #159

    andrewjmen

    here's another one, black can still castle on both sides but that doesn't really matter

  • 2 years ago · Quote · #160

    andrewjmen

    is it too hard or is it too easy that nobody wants to answer?


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